Erasing using backspace control character

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The usual way of erasing the last character on the console is to use the sequence "\b \b". This moves the cursor back one space, then writes a space to erase the character, and backspaces again so that new writes start at the old position. Note that \b by itself only moves the cursor.

Of course, you could always avoid outputting the comma in the first place:

if(i > 0) cout << ",";
cout << a[i];

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